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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8cd9ddf7f6e3eca0e1cd7cc0e0adf786e8cc8ca01383849b95f19aa61183a8c' 
  AND token = 'MnJzcTx7cPBKwF8fHXP0zQkxfJGdG2UZsvhw0gKOskA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}